Once you get the black horse, you'll be able to 1 or 2-hit kill enemies by trampling. There's an area up ahead where enemies will continuously spawn, jumping down from the cliffside near one of the gates. Trample them over and over for infinite orbs, making it easiest to level up your abilities without having to play stages over.

Edit: Tried it again. It's not infinite but you can nab an easy 200 points at least from them before they eventually stop spawning.